Tehuantepec Forecast

April 21, 2026, 9:01 pm (UTC: -04:00)
Subject: Tehuantepec Forecast

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This forecast has not been reviewed. It was generated from an automatic model.

WARNINGS
.NONE.

.GULF OF TEHUANTEPEC N OF 14.5N N TO NE WINDS 20 TO 25 KT. SEAS
TO 2.5 M. ELSEWHERE WITHIN 15N95W TO 15N96W TO 14N97W TO 13N96W
TO 13N95W TO 15N95W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN N
TO NE SWELL.

MIDDAY SATELLITE SCATTEROMETER DATA SHOWED FRESH TO STRONG
NORTHERLY GAP WINDS TO 30 KT ACROSS THE GULF OF TEHUANTEPEC, AND
EXTENDING SOUTHWARD TO 13.5N. SEAS IN THESE WATERS ARE ESTIMATED
AT 6-9 FT, WITH RECENT ALTIMETER DATA SHOWING SEAS TO 8 FT
EXTENDING SOUTHWARD TO NEAR 09N.
FOR THE FORECAST, ATLANTIC HIGH PRESSURE EXTENDING ACROSS THE
GULF OF AMERICA WILL BEGIN TO WEAKEN TONIGHT THROUGH WED AS THE
HIGH SHIFTS NORTHEASTWARD. THIS WILL LEAD TO A SIGNIFICANT
DECREASE IN GAP WINDS ACROSS THE GULF OF TEHUANTEPEC TONIGHT
THROUGH WED MORNING, THEN A SHIFT TO S TO SW WINDS THERE THROUGH
THE REMAINDER OF THE WEEK. ELSEWHERE, A WEAK COLD FRONT
EXTENDING FROM SOUTHERN CALIFORNIA THROUGH 30N120W AND BEYOND
WILL MOVE SOUTHEASTWARD AND INTO THE BAJA NORTE WATERS THIS
EVENING THROUGH TONIGHT THEN DISSIPATE WED MORNING. NEW HIGH
PRESSURE BEHIND THIS FRONT WILL BEGIN TO BUILD ACROSS THE BAJA
WATERS WED, AND ACT TO INCREASE WINDS MODESTLY THROUGH EARLY FRI
BEFORE WEAKENING INTO FRI NIGHT. NEW NW SWELL GENERATED BEHIND
THE FRONT WILL MOVE INTO THE BAJA CALIFORNIA NORTE WATERS TONIGHT
AND SPREAD SOUTHEASTWARD TO THE REVILLAGIGEDO ISLANDS THROUGH
WED NIGHT. SEAS ARE EXPECTED TO PEAK TO AROUND 8 FT ACROSS NORTH
AND CENTRAL PORTIONS OF THE BAJA WATERS WITH THIS SWELL.
ELSEWHERE, MOSTLY LIGHT TO GENTLE WEST TO NORTHWEST WINDS ARE
EXPECTED THROUGH THE END OF THE WEEK AND INTO THE UPCOMING
WEEKEND.

SHORT-TERM TEHUANTEPEC
TODAY - Not available yet
TONITE - Not available yet
THURSDAY - SW 10-12, Seas SSW 1.8-4.4 ft @ 14sec
THURSDAY NIGHT - NNW 8-10, Seas SSW --? ft @ 16sec

LONG-TERM TEHUANTEPEC
FRIDAY - SSW 9-11, Seas SSW 2-4 ft @ 13sec
SATURDAY - SW 10-12, Seas SSW 2.1-4 ft @ 13sec
SUNDAY - SW 8-10, Seas SSW 1.5-3.9 ft @ 17sec
MONDAY - WSW 7-9, Seas N/A ?-? ft @ ?
TUESDAY - Not available yet